Changes in Operations Divestiture of GWAHLP (Details) - AUD ($) $ in Millions	9 Months Ended
Jul. 01, 2020	Sep. 30, 2019
MIRA [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners		48.90%
Scenario, Forecast [Member] \| GWAHLP [Member] \| Australia Operations [Member]
Proceeds from Divestiture of Businesses	$ 627.4

The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585

Name:	us-gaap_ProceedsFromDivestitureOfBusinesses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration